Duffel bag



FIG. 1 is a top, front, right perspective view of a duffel bag showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a top view thereof.

The contrast in shading represents a contrast in appearance only and does not represent any particular color, material, texture or finish. The broken lines on the shaded surfaces of the bag illustrate stitching and a zipper track and form part of the claimed design. The remaining unshaded broken lines illustrate portions of the duffel bag and form no part of the claimed design. 

CLAIM The ornamental design for a duffel bag, as shown and described. 